Zoom lens

Details Zoom lens Zoom lens

2007-05-08

2007-05-08

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000, C359S740000, C359S716000, C359S753000, C359S781000, C359S784000

Reexamination Certificate

active

11343037

ABSTRACT:
A zoom lens system includes a first lens group which has a negative refractive power, a second lens group which has a positive refractive power, and a third lens group which has a positive refractive power in this order from the object side and changes the distances among these lens groups to vary the power from the wide-angle end to the telephoto end. The second lens group has a three-element cemented lens including a positive lens c1,a negative lens c2,and a positive lens c3.

REFERENCES:
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patent: 6563644 (2003-05-01), Suzuki
patent: 6606204 (2003-08-01), Toyama
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patent: 2006/0056045 (2006-03-01), Yoshitsugu
patent: 2006/0056067 (2006-03-01), Yanai et al.
patent: 2006/0072212 (2006-04-01), Nanba et al.
patent: 2004-325975 (2004-11-01), None

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